Are you planning to buy one these TB6560 boards from eBay to use with your home made CNC? Then you need to know about many issues with these boards. Issues like the motor loosing steps or stall are very common. Some people prefer to use the Gecko G540 board, but this boars is about 10 times more expansive than these TB6560 boards.
But all is not lost! You can do some modifications to fix these issues, please read this loooong thread at cnczone about how to fix it:
This guy modified his board following the instructions from CNCZone:
http://www.homediystuff.com/fixing-a-chinese-made-cnc-stepper-motor-driver-board-tb6560-chips/
More info about this 4-axis TB6560 blue board:
http://reprap.org/wiki/4_Axis_TB6560_CNC_Stepper_Motor_Driver_Board_Controller
Alan C. Assis 